Westlake Corporation (NYSE: WLK), a global manufacturer and supplier of materials and innovative products, will showcase its solutions that enhance your life every day at NPE 2024 in OCCC West Hall Booth 203 ABC, to be held from May 6-10 in Orlando, Florida. “We are excited to participate in NPE 2024 to present our products and sustainable solutions,” said Amy Moore, Vice President, Westlake Polyethylene. “Westlake strives to deliver high-value, essential products for our customers across several sectors — including healthcare, automotive, agriculture and water systems, food packaging, and housing materials. We endeavor to produce and deliver these goods in increasingly sustainable ways.” Under the theme of “Enhancing Your Life Every Day,” three of Westlake’s businesses will showcase their products: Westlake Global Compounds, Westlake Polyethylene and Westlake North American Vinyls. “As a global leader that produces and manufactures essential materials, we understand the critical role

Pool Chemistry Resources Support Summertime Proper Aquatic Chlorination Commercial pools around the country will soon open, ushering in the start of the summer season. In recognition of National Water Safety Month, which began on May 1 st , Westlake Water Solutions, a business unit of Westlake Corporation (NYSE: WLK); and NSF International, a leading public health and safety organization that provides testing and standards, are reminding health inspectors and pool operators about the importance of using properly specified chlorine tablets in their certified sanitizing systems. “Along with the sun and fun that come with commercial water, it is important to properly chlorinate commercial pools with feeder systems that can keep up with degradation of chlorine due to heavy bather loads, rain and the sun’s ultraviolet rays,” said Austin Looper, director, Westlake Water Solutions business. “Organizations like NSF, the U.S. Centers for Disease Control and Prevention and the American

Declared quarterly distribution of $0.4714 per unit; 39 th consecutive quarterly distribution Westlake Chemical Partners LP (NYSE: WLKP) (the "Partnership") today reported net income attributable to the Partnership in the first quarter of 2024 of $14.8 million, or $0.42 per limited partner unit, which was in-line with first quarter 2023 net income of $14.9 million. Cash flows from operating activities in the first quarter of 2024 were $104.6 million, a decrease of $40.3 million compared to first quarter 2023 cash flows from operating activities of $144.9 million, due to less favorable working capital changes. For the three months ended March 31, 2024, MLP distributable cash flow was $16.9 million, a decrease of $0.7 million compared to first quarter 2023 MLP distributable cash flow of $17.6 million. The decrease in MLP distributable cash flow and associated trailing twelve-month coverage ratio was primarily due to lower production and sales volume. First quarter 2024 net income

Record first quarter Housing and Infrastructure Products (HIP) income from operations of $210 million with a 20% operating income margin HIP EBITDA of $264 million rose 29% year-over-year with a record first quarter EBITDA margin of 25% PEM sales volume grew 3% sequentially from gradual demand recovery with stable average sales prices Westlake Corporation (NYSE: WLK) (the "Company" or "Westlake") today announced first quarter 2024 results. SUMMARY FINANCIAL HIGHLIGHTS (in millions of dollars, except per share data and percentages) Three Months Ended March 31, 2024 Three Months Ended December 31, 2023 Three Months Ended March 31, 2023 Westlake Corporation Net sales $ 2,975 $ 2,826 $ 3,356 Income (loss) from operations $ 223 $ (552 ) $ 536 Net income (loss) attributable to Westlake Corporation $ 174 $ (497 ) $ 394 Diluted earnings (loss) per common share $ 1.34 $ (3.86 ) $ 3.05

$0.4714 per unit distribution declared payable on May 29, 2024 The Board of Directors of Westlake Chemical Partners GP LLC, the general partner of Westlake Chemical Partners LP (the "Partnership") (NYSE:WLKP), has declared a distribution of $0.4714 per unit. This is the 39th quarterly distribution announced by the Partnership since its initial public offering. The distribution will be payable on May 29, 2024, to unit holders of record on May 13, 2024. This release is intended to be a qualified notice under Treasury Regulation Section 1.1446-4(b). Brokers and nominees should treat one hundred percent (100.0%) of the Partnership’s distributions to non-U.S. investors as being attributable to income that is effectively connected with a United States trade or business. Accordingly, the Partnership’s distributions to non-U.S. investors are subject to federal income tax withholding at the highest applicable effective tax rate. About Westlake Chemical Partners LP Westlake Chemical Partners is

Westlake Corporation (NYSE: WLK) announced today that Westlake Epoxy will launch several new lower yellowing epoxy products at the American Coatings Show 2024, to be held in Indianapolis, Indiana (USA) from April 30 to May 2, 2024. The Deep Pour Lower Yellowing Epoxy System is Epoxy Research Resin RSL-4710 combined with Research Curing Agent RSC-4731. This two-component epoxy/amine system is formulated for extended set time and lower exotherm temperature. The system offers superior air release and improved color retention even in direct sunlight. “The Deep Pour Lower Yellowing Epoxy System offers easier use enabling up to 4-inch pours in a single application,” said Dan Weinmann, Business Development Manager - Epoxy, Americas. “This system does not use additives to improve yellowing resistance. The resin and curing agent combination have improved light stability built into the cured epoxy thermoset backbone.” Westlake Epoxy is also promoting an ultra-low yellowing cycloaliphatic amine

Westlake Chemical Partners (NYSE: WLKP) will release its first quarter 2024 earnings prior to the market opening on Wednesday, May 1, 2024. The company will host a conference call at 1:00 p.m. Eastern Time (12:00 p.m. Central Time) on the same day to discuss the earnings release. To access the conference by phone, it is necessary to pre-register at https://register.vevent.com/register/BI945f608342d94f3bb7f420c75004538c . Once registered, you will receive a phone number and unique PIN number. When you dial in, you will input the PIN number to be placed into the call. The conference call and replay will be available via webcast at https://edge.media-server.com/mmc/p/2ry9ktig and the earnings release can be obtained via the company's Web page at, https://investors.wlkpartners.com/corporate-profile/default.aspx . About Westlake Chemical Partners: Westlake Chemical Partners is a limited partnership formed by Westlake Corporation to operate, acquire and develop ethylene production

Westlake Corporation (NYSE: WLK) will release its first quarter 2024 earnings prior to the market opening on Wednesday, May 1, 2024. The company will host a conference call at 11:00 a.m. Eastern Time (10:00 a.m. Central Time) on the same day to discuss the earnings release. To access the conference by phone, it is necessary to pre-register at https://register.vevent.com/register/BI6dd9f6d378244f26a329eb8dfb3d39ae . Once registered, you will receive a phone number and unique PIN number. When you dial in, you will input the PIN number to be placed into the call. The conference call and replay will be available via webcast at https://edge.media-server.com/mmc/p/b4szy7np and the earnings release can be obtained via the company’s Web page at https://investors.westlake.com/news/default.aspx . About Westlake: Westlake is a global manufacturer and supplier of materials and innovative products that enhance life every day. Headquartered in Houston, with operations in Asia, Europe and North

Westlake Chemical Partners LP (the “Partnership”) (NYSE: WLKP) today provided an update on the availability of the Partnership’s 2023 Investor Tax Packages including Schedule K-1 for its common unitholders. The Partnership’s 2023 K-1 tax packages are now available. The information reported to you on Schedule K-1 is based on tax laws currently in effect for 2023. This information may be subject to change depending on actions taken by Congress and the President. If the Tax Relief for American Families and Workers Act of 2024 (H.R. 7024), which passed the House of Representatives on January 31, 2024 and is currently awaiting action in the Senate, were to become law, it may require us to make changes to our tax reporting for 2023. Such changes may affect the information reported to you on Schedule K-1. Online K-1 Access To obtain the Partnership’s 2023 Investor Tax Packages including Schedule K-1 immediately, sign-up for paperless K-1 delivery, view K-1s from previous years, update